联系方式

联系电话：0632-3460157 5113056
0632-3460159 5113059
0632-5129936 5122116
外贸电话：0632-5113066
传真：0632-3460156
厂址：枣庄市市中区西王庄乡
E-Mail：th@thwater.com

羟基乙叉二膦酸 HEDP 性能与用途

别名：羟基亚乙基二膦酸

CAS No. 2809-21-4

分子式 C₂H₈O₇P₂ 相对分子质量：206.02

结构式

HEDP是一种有机膦酸类阻垢缓蚀剂，能与铁、铜、锌等多种金属离子形成稳定的络合物，能溶解金属表面的氧化物。在250℃下仍能起到良好的缓蚀阻垢作用，在高pH下仍很稳定，不易水解，一般光热条件下不易分解。耐酸碱性、耐氯氧化性能较其它有机膦酸(盐)好。可与水中金属离子，尤其是钙离子形成六圆环螯合物，因而具较好的阻垢效果并具明显的溶限效应，当和其它水处理剂复合使用时，表现出理想的协同效应。

HEDP固体属于高纯产品，适用于冬季严寒地区；特别适用于电子行业的清洗剂和日用化学品添加剂。

HEDP广泛应用于电力、化工、冶金、化肥等工业循环冷却水系统及中、低压锅炉、油田注水及输油管线的阻垢和缓蚀；在轻纺工业中，可以作金属和非金属的清洗剂，漂染工业的过氧化物稳定剂和固色剂，无氰电镀工业的络合剂，医药行业作放射性元素的携带剂。

羟基乙叉二膦酸 HEDP 技术指标:

项目	指标
项目	HG/T 3537-1999
外观	无色或淡黄色透明液体	白色粉末状固体
活性组分（以HEDP计）％ ≥	50.0 60.0	89.0
亚磷酸（以PO₃^3-计）% ≤	2.0 2.0	0.80
磷酸（以PO₄^3-计）% ≤	0.8 0.8	0.50
氯化物（以Cl^-计）% ≤	0.01 0.01	0.10
PH值（1％水溶液） ≤	2 2	2.0
密度（20℃）g/cm³ ≥	1.34 1.40	——
钙螯合值mg/g ≥	450 500	——
铁（以Fe3+计）含量 mg/L ≤	10 10	5.0
活性组份（以HEDP•H₂O计）% ≥	——	98.0

羟基乙叉二膦酸 HEDP 使用方法:

HEDP广泛应用于电力、化工、冶金、化肥等工业循环冷却水系统及中、低压锅炉、油田注水及输油管线的阻垢和缓蚀；在轻纺工业中，可以作金属和非金属的清洗剂，漂染工业的过氧化物稳定剂和固色剂，无氰电镀工业的络合剂。HEDP作阻垢剂一般使用浓度1～10mg/L，作缓蚀剂一般使用浓度10-50mg/L；作清洗剂一般使用浓度1000～2000mg/L；通常与聚羧酸型阻垢分散剂配合使用。

羟基乙叉二膦酸 HEDP 包装与贮存:

HEDP液体用塑料桶包装，每桶30Kg或250Kg；HEDP固体用内衬聚乙烯袋的塑料编织袋包装，每袋净重25kg，也可根据用户需要确定。贮于室内阴凉通风处，防潮，贮存期十个月。

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid
(HEDP)

CAS No. 2809-21-4

Molecular Formula: C₂H₈O₇P₂ Molecular weight: 206.02

Properties:

HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds.It can dissolve the oxidized materials on these metals’ surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250℃. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions. Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt). HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.

The solid state of HEDP is crystal powder, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals.

Specification:

items	index
Appearance	Colorless or light yellow transparent liquid	White crystal powder
Active content (HEDP)%	58.0-62.0	90.0min
Phosphorous acid (as PO₃^3-⁾%	2.0 max	0.8 max
Phosphoric acid (asPO₄^3- )%	0.8 max	0.5 max
Chloride (as Cl^-)%	1.0 max	0.1max
pH (1% solution)	2 max	2 max
Density (20℃)g/cm³	1.40	-
Fe，mg/L	10 max	5 max
Colour APHA (Hazen)	40 max	-

Usage:

HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent. The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.

Package and Storage:

HEDP liquid: Normally In 250kg net Plastic Drum, IBC drum can also be used as required HEDP solid: 25kg inner liner polyethylene (PE) bag, outer plastic woven bag, or confirmed by clients.

Storage for ten months in room shady and dry place.